August 2000
CO230 : COGNITIVE SCIENCE

QUESTION 3

Total Marks: 15 Marks

• Question 1
• Question 2
• Question 4
• Question 5
• Cover Page

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SUGGESTED SOLUTIONS
for Question 3

(a) Draw a labeled diagram of a binary output artificial neuron activated by a step threshold function. Show clearly the calculations involved. [3]

(b) Given the following information:

input vector [x1,x2] weight vector [w1, w2] threshold, t target output, o

[1, 0] [0.25, 0.25] 0.30 1

(i) Calculate the output of the neuron, showing clearly the working. [2]
(ii) Using the values calculated above, explain the learning process. [3]
(iii) Briefly describe the type of learning involved for the above situation. [3]

(c) With the aid of a labeled diagram, describe what is meant by a multilayer
artificial neural network. State one advantage of such a network. [4]